local variation of image

2011 5 7
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I want to calculate the local standard variation in a sliding window for an image. How it should be done using matlab ??

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nayomi ranamuka
nayomi ranamuka 2011-5-8

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Thank you. Regarding to your comments I've a solution also. J = colfilt(I,[5 5],'sliding',@std); I hope your suggestions for my solution.

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Hi, your solution is good, too! The function stdfilt is probably much faster, but if this is not a problem right now, colfilt is a good alternative.

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Hi,
http://www.mathworks.com/help/toolbox/images/ref/stdfilt.html
or
doc stdfilt
Hope this helps, Wolfgang

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nayomi ranamuka
nayomi ranamuka 2011-5-7
Thank you. But I want to calculate the local standard variation for each pixel x within a window W(x).
nayomi ranamuka
nayomi ranamuka 2011-5-7
W(x) is a sub Window of image.
Walter Roberson
Walter Roberson 2011-5-7
Yes?
J = stdfilt(I, NHOOD) calculates the local standard deviation of the input image I, where you specify the neighborhood in NHOOD. NHOOD is a multidimensional array of zeros and ones where the nonzero elements specify the neighbors. NHOOD's size must be odd in each dimension.
nayomi ranamuka
nayomi ranamuka 2011-5-7
Ok. Thank you. I'm new for matlab & image processing .I would like to know how can I apply J = stdfilt(I, NHOOD) for sliding window in an image.
What exactly is the problem? Did you try to run the example in the documentation?
Walter Roberson
Walter Roberson 2011-5-7
J = stdfilt(I, ones(5,5));

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